The Amp Garage

I built a Rocket with VVR. Same circuit as Hall. It should be the same cathode bias as Liverpool. Check out my posts.

Rocket is pretty much done. Sounds great. No hum...no fuss..VVR works. NOS GE 12AX7 tubes in first 2 stages. NOS Reflektor Russian EL84's. NOS GE rectifier tube. RJ provided the Transformers. Much tamer than an Express. I eventually wired the VVR out to the standby switch. The standby then goes out ...

Thanks Dorrisant! Here's the layout I was going to use. Rocket Layout.jpg Where am I going wrong? Should the standby switch out go to B1+ and choke separately? I found this layout showing the VVR before the standby switch. Seems like the same circuit. LayoutH1d-4VVR-Build.jpg Any help (from anybody)...

IMG_0043.JPG New Rocket build with VVR integrated into the filter cap board. Biggest challenge will be mounting power transformer then re-installing VVR/Filter cap board. I can do it! I am not SURE about the placement of VVR in relation to choke. My plan is to place the choke in line with B+ out of...

VVR Trainwreck.JPG This is my Trainwreck CLONE with the VVR installed. Pot is on back of amp. Wiring snakes along the back of the chassis. No hum. No noise. Works great. I found the Mosfets on ebay. Dual gang pot at Amplified Parts. I added a 2k2 resistor before pin7 on input tube. I believe this w...

Train.JPG I've attached the pdf of the layout. It has not been checked by anybody so use at your own risk....It works this way for me. The added caps and resistors on input and volume pot are used to fix scratchy pots at low volume.....so they say. I am not an electronics expert, I only wished that...

I have a pdf layout for point to point fixed bias VVR in a Wreck Express clone. It requires NTE 2372, NTE 2973 Mosfets (I found on Ebay) and a dual 1Meg 1/2 Watt Linear pot to work. It works great in my Wreck clone. I'm cautious to post. What shall I do with it? Not looking to make any profit. Just ...

Have you tried using aluminum flashing as shield over the top. It will hum and pick up radio stations if the enclosure isn't completeley isolated. Try grounding the output jacks to the ground in front of the Big Caps. Try grounding a cap to the input jack (not sure what value)? Mine hummed at first,...

All clips were recorded exactly the same. Head on top of speaker. In the beginning (2 years ago) I moved the head off of the speaker, used tube dampers, stuffed foam in the cab, all sorts of things to get rid of rattle. If the head was in the same room as the speaker it rattled. Now I use a NOS Tele...

Your son had better appreciate that amp. Very nice.

I recorded a Groove Tubes GT12AX7M in my Express and a NOS Telefunken (KCA Nos Tubes) in V1 only. V2 & V3 were not changed and Siemens EL34 were not changed and settings were the same as the first recorded clip but with no reverb added (2nd less compressed). The first 3 notes are the GT12AX7M, chang...

Noel, The tube thing for me was "rattle". Tone really had nothing to do with it at the time (tone was certainly improved by using NOS tubes). I used new production tubes, and I heard a tinny rattle on low notes (E,A,D). I always thought it was the amp. I tried NOS tubes (even some NOS tubes rattle) ...

M75 65Watt Scumback. The first little bit of the clip was actually through a Celestion Vintage 30 and compressed a bit more. The 2nd longer passage was through the Scumback. New out of the box. Thank you Southbay Ampworks! You could tell...couldn't you.

Well, after 2 years. Yep...years, I've finished my Express. Boy did I learn a lot. Mainly....somewhat how to solder, how to bias an amp, how expensive it can really be, and most importantly......TUBES make a huge difference in this amp. This is representative of my re-build. My first build was hexed...

SRS Biastool mA